V.L. Lomtev. THE STRUCTURE OF NORTHERN KURIL-KAMCHATKA TRENCH AND ADJACENT AREAS

https://doi.org/10.15407/gpimo2018.02.015

Geology and Mineral Resources of World Ocean 2018, 14 (2): 15-29

V.L. Lomtev
Institute of Marine Geology and Geophysics, Far East Division RAS, Yuzhno-Sakhalinsk, Russia

THE STRUCTURE OF NORTHERN KURIL-KAMCHATKA TRENCH AND ADJACENT AREAS

The structure of northern Kuril-Kamchatka trench and adjacent areas are analysed by sounding and SCP data. It is showed, that Kuril-Kamchatka and Aleutian trenches are young, imposed morphostructures with elements of virgation, partly filled turbidites of Kamchatka canyons. Orographic barrier between trenches and inclined abyssal plain are the part of NW Pacific abyssal floor. Cenozoic cover of trenches and adjacent abyssal floor are two-story structure and here gas bearing. Its upper strata probably composed turbidites of Kamchatka canyon fans before Kuril-Kamchatka trench formation in the Middle Pleistocene. Oceanic cover observe at 10—18 km under the inner side of Kuril-Kamchatka trench (accretionary prism), that supposed its nappe, thrust structure. The correlation between submarine terminations of eastern peninsulas and bathyal ridge-barriers make on the Pacific margin of Kamchatka. The tie of Kamchatka canyons with NW faults and different ages of abraded-accumulative plains of shelf and avanshelf are projected. The fragmentation, sharp changes of steepness and bathymetric position of avanshelf send probably contrast tectonics of Benioff focal zone — greatest recent fault of the Earth.

Key words: NW Pacific abyssal floor, joint of Kuril Kamchatka and Aleutian trenches, Obruchev rise, Cenozoic cover, canyon, abyssal channel, slide.

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